GeoscienceAustralia#505 Add jslint via github actions

Signed-off-by: Tisham Dhar <[email protected]>

.github/workflows/main.yml

@@ -0,0 +1,21 @@
+name : Deploy Terria Config
+
+on:
+  push:
+    paths:
+      - 'dev/terria/**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 0
+
+    - name: Run Json Linter
+      run: |
+        npm install jsonlint -g
+        jsonlint dev/terria/dea-maps.json